What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Back to Search

nielsen.com

https://nielsen.com· First analyzed 11 Feb 2026· Updated 11 Feb 2026

Export

nielsen.com

Mobile

Sponsored

Hosting Provider

Automattic, Inc

IP Address

192.0.66.96

Server Location

🇺🇸 San Francisco, United States

ASN

AS2635

Server

Nginx

CDN

Nameservers

pdns3.ultradns.org.pdns4.ultradns.org.pdns5.ultradns.info.pdns6.ultradns.co.uk.+2 more

Performance

Page Speed

2.1 MB

60 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

Alpine.js

Styling

Tailwind CSS

CMS

WordPressv6.7.4

Infrastructure

Hosting

Automattic, Inc

CDN

Technology Stack

19 Technologies Detected

Plugins

Nlsn 2021 Blocks Nlsn Filters For Blocks Wp Swiper

WooCommerce

Woocommerce Gateway Stripe

Analytics

Frameworks

Libraries

UI Components

CSS Frameworks

Fonts

Tag Managers

Other

Web Servers

Security

Customer Support

SEO Analysis

A82/100

nielsen.comnielsen.com

Nielsen | Audience Is Everything®

A global leader in media measurement, analytics and insights, Nielsen shapes the future of media with accurate measurement of what people listen to and watch...

Description truncated.

Title Length33 chars

Recommended: 50-60 chars

Description Length168 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (10/14)

2 issues found

Upgrade to view details

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

28d

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟡 300s(max-age=300, must-revalidate)

content-encoding

⚡ Brotli(br)

content-security-policy

frame-ancestors 'self' https://nielsensports.com https://www...

content-type

text/html; charset=UTF-8

date

Wed, 11 Feb 2026 10:20:00 GMT

Good Warning Issue

Typography & Readability

inter

88/100

Readability

/30

40/40

18px · LH 1.67

Hierarchy

/20

25/25

3.11x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

inter

Sans56px

Body Font

inter

Sans18px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

56px

48px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.67 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.1x larger than body text.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

GGoogle Fonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

A/B Testing & Optimization

AB TastyMid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

nielsen.com(7)googletagmanager.com(4)cdn.cookielaw.org(2)geolocation.onetrust.com(1)cdnjs.cloudflare.com(1)

Website Identity

nielsen.com

Sponsored

Last analyzed: 11 Feb 2026 at 10:20

Historical Analysis & Change Tracking